Abstract
The early prediction of hypoxic encephalopathy after cardiac arrest is challenging. Measurement of the optic nerve sheath diameter (ONSD) by using sonography is a straightforward, noninvasive technique to detect an increased intracranial pressure, which can even be conducted at the bedside. However, it remains unknown whether or not sonographic ONSD measurement is valuable as a prognostic indicator of hypoxic encephalopathy. Seventeen patients after cardiac arrest were retrospectively enrolled in this study. ONSD measurements 3mm behind the papilla were recorded. A Glasgow Outcome Scale score of 4 or above was considered to indicate a favorable prognosis. The mean ONSD associated with a favorable prognosis was 5.0 mm (4.4-6.1mm). The ONSD associated with a poor prognosis was 6.1 mm (5.4-7.2mm). ONSD less than or equal to 5.4 mm was an indicator of a favorable prognosis, with a sensitivity of 83%, specificity of 73%, positive likelihood ratio of 3.1, and negative likelihood ratio of .23. Sonographic ONSD measurement is a simple, rapid technique to assess the neurological prognosis after cardiac arrest.
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